The CDC is investigating 2 separate American Airlines flights after 12 passengers became ill with flu-like symptoms

The CDC is investigating after 12 American Airlines passengers on two separate flights from Europe to Philadelphia International Airport fell ill with flu-like symptoms on Thursday.

The two American Airlines flights originated in Paris and Munich.

According to the CDC, affected passengers exhibited symptoms such as a sore throat and cough, but none had a fever.

The incident comes one day after an Emirates jet was quarantined at JFK Airport in New York and 11 passengers were with hospitalized flu-like symptoms.

The Centers for Disease Control and Prevention is investigating after 12 American Airlines passengers on two separate flights from Europe to Philadelphia International Airport fell ill with flu-like symptoms on Thursday.

"This afternoon, 12 passengers arriving at Philadelphia International Airport on international flights on American Airlines from Paris and on American Airlines from Munich were experiencing flu-like symptoms," the airport said in a statement.

"As a precaution, all passengers on the two flights - totaling about 250 plus crew - were held for a medical review and the CDC was notified."

According to the CDC, the sick passengers reported experiencing a sore throat and cough, but none had a fever.

"None of the passengers are severely ill, and they will be released and informed of test results in 24 hours," the agency said in a statement.

"For the 11 individuals taken to the hospital, preliminary tests indicate that some patients tested positive for influenza and/or other common respiratory viruses," the CDC said in a statement regarding the Emirates passengers. "Patients are being treated by the hospital, including receiving antivirals."

The passengers and crew who were quarantined on Wednesday in New York reported having a cough, fever, and symptoms of gastrointestinal illness during the 14-hours flight from Dubai, United Arab Emirates.